公开(公告)号：BR8102711A

公开(公告)日：1982-01-26

申请号：BR8102711

申请日：1981-05-04

Applicant: STANDARD OIL CO OHIO

Inventor： MILBERGER E ,  DRIA D

IPC: C07D307/60 ,  B01J23/00 ,  B01J23/22 ,  B01J27/18 ,  B01J27/198 ,  C01B25/37 ,  C07B61/00 ,  C07C51/215

Abstract: Improved oxidation catalysts containing mixed oxides of vanadium and phosphorus which catalysts are particularly effective in the oxidation of n-butane, n-butenes, 1,3-butadiene or a mixture thereof with molecular oxygen or an oxygen-containing gas in the vapour phase to produce excellent yields of maleic anhydride with very good selectivity, are prepared by a process in which at least one vanadium compound, a substantial portion of which is in the pentavalent state, and at least one phosphorus-containing compound is added to an organic liquid medium capable of reducing at least a portion of the vanadium to a +4 valence state, to form a reaction mixture. Partial reduction of the vanadium is effected in the presence of the phosphorus-containing compound and a highly ordered and uniform mixed vanadium phosphorus oxide-containing catalyst precursor is formed. An oxidation catalyst comprising the mixed oxides of vanadium and phosphorus characterized by an average valence state of vanadium from +3.9 to +4.6, and a phosphorus to vanadium ratio of 1 : 1 to 1.2 : 1, wherein the macrostructure of the catalyst predominantly comprises generally spheroid particles consisting of stacks of integrally associated sheets of catalytic material is also disclosed.

公开(公告)号：BR8005649A

公开(公告)日：1981-06-30

申请号：BR8005649

申请日：1980-09-04

Applicant: STANDARD OIL CO

Inventor： BREMER N ,  DRIA D

IPC: C07D307/60 ,  B01J27/18 ,  B01J27/198 ,  C01B25/37 ,  C07B61/00 ,  C07C51/215 ,  C07C51/25 ,  C07C57/145 ,  B01J23/22 ,  B01J27/16